Support custom build directories and move includes

[zfs.git] / include / sys / uberblock_impl.h

diff --git a/include/sys/uberblock_impl.h b/include/sys/uberblock_impl.h
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+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ */
+
+#ifndef _SYS_UBERBLOCK_IMPL_H
+#define        _SYS_UBERBLOCK_IMPL_H
+
+#include <sys/uberblock.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * The uberblock version is incremented whenever an incompatible on-disk
+ * format change is made to the SPA, DMU, or ZAP.
+ *
+ * Note: the first two fields should never be moved.  When a storage pool
+ * is opened, the uberblock must be read off the disk before the version
+ * can be checked.  If the ub_version field is moved, we may not detect
+ * version mismatch.  If the ub_magic field is moved, applications that
+ * expect the magic number in the first word won't work.
+ */
+#define        UBERBLOCK_MAGIC         0x00bab10c              /* oo-ba-bloc!  */
+#define        UBERBLOCK_SHIFT         10                      /* up to 1K     */
+
+struct uberblock {
+       uint64_t        ub_magic;       /* UBERBLOCK_MAGIC              */
+       uint64_t        ub_version;     /* SPA_VERSION                  */
+       uint64_t        ub_txg;         /* txg of last sync             */
+       uint64_t        ub_guid_sum;    /* sum of all vdev guids        */
+       uint64_t        ub_timestamp;   /* UTC time of last sync        */
+       blkptr_t        ub_rootbp;      /* MOS objset_phys_t            */
+
+       /* highest SPA_VERSION supported by software that wrote this txg */
+       uint64_t        ub_software_version;
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SYS_UBERBLOCK_IMPL_H */